PRISTINA, Serbia (Reuters) - Kosovo Albanian separatist leaders boycotted talks with Serbian government negotiators on Friday until Serbian police halt an offensive and withdraw from the disputed province. The Albanians resisted intense U.S. diplomatic pressure to attend the meeting as fighting continued in central and western regions between police and guerrillas of the Kosovo Liberation Army (KLA). Spokesman Xhemail Mustafa told reporters: „The dialogue has not been halted, only moved until the necessary conditions have been created. These are the removal of (Serbian) forces from Kosovo and the deblockade of areas affected by the attacks.“ U.S. mediator Christopher Hill met the ethnic Albanian leaders on Friday morning as senior Serbian government ministers waited for the talks. But he failed to change their minds. Police have sealed off the area where their offensive has lasted for almost a week. Kosovo Albanians, who make up 90 percent of province‘s 1.8 million population, are demanding independence and have been offered autonomy by Serbia. Their negotiating teams have sat down together only once since the US in mid-May brokered an agreement between them to meet weekly.